Issue #14172: Fix reference leak when marshalling a buffer-like object (other than a bytes object).

3 files changed, 30 insertions, 4 deletions

diff --git a/Lib/test/test_marshal.py b/Lib/test/test_marshal.py
index cd100f9..9a25012 100644
--- a/Lib/test/test_marshal.py
+++ b/Lib/test/test_marshal.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 
 from test import support
+import array
 import marshal
 import sys
 import unittest
@@ -137,6 +138,27 @@ class ContainerTestCase(unittest.TestCase, HelperMixin):
         for constructor in (set, frozenset):
             self.helper(constructor(self.d.keys()))
 
+
+class BufferTestCase(unittest.TestCase, HelperMixin):
+
+    def test_bytearray(self):
+        b = bytearray(b"abc")
+        self.helper(b)
+        new = marshal.loads(marshal.dumps(b))
+        self.assertEqual(type(new), bytes)
+
+    def test_memoryview(self):
+        b = memoryview(b"abc")
+        self.helper(b)
+        new = marshal.loads(marshal.dumps(b))
+        self.assertEqual(type(new), bytes)
+
+    def test_array(self):
+        a = array.array('B', b"abc")
+        new = marshal.loads(marshal.dumps(a))
+        self.assertEqual(new, b"abc")
+
+
 class BugsTestCase(unittest.TestCase):
     def test_bug_5888452(self):
         # Simple-minded check for SF 588452: Debug build crashes
@@ -243,6 +265,7 @@ def test_main():
                               CodeTestCase,
                               ContainerTestCase,
                               ExceptionTestCase,
+                              BufferTestCase,
                               BugsTestCase)
 
 if __name__ == "__main__":
diff --git a/Misc/NEWS b/Misc/NEWS
index c1385f3..9c854a2 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,9 @@ What's New in Python 3.2.3 release candidate 1?
 Core and Builtins
 -----------------
 
+- Issue #14172: Fix reference leak when marshalling a buffer-like object
+  (other than a bytes object).
+
 - Issue #13521: dict.setdefault() now does only one lookup for the given key,
   making it "atomic" for many purposes.  Patch by Filip Gruszczyński.
 
diff --git a/Python/marshal.c b/Python/marshal.c
index 094f732..7b1af44 100644
--- a/Python/marshal.c
+++ b/Python/marshal.c
@@ -411,11 +411,12 @@ w_object(PyObject *v, WFILE *p)
     else if (PyObject_CheckBuffer(v)) {
         /* Write unknown buffer-style objects as a string */
         char *s;
-        PyBufferProcs *pb = v->ob_type->tp_as_buffer;
         Py_buffer view;
-        if ((*pb->bf_getbuffer)(v, &view, PyBUF_SIMPLE) != 0) {
+        if (PyObject_GetBuffer(v, &view, PyBUF_SIMPLE) != 0) {
             w_byte(TYPE_UNKNOWN, p);
+            p->depth--;
             p->error = WFERR_UNMARSHALLABLE;
+            return;
         }
         w_byte(TYPE_STRING, p);
         n = view.len;
@@ -427,8 +428,7 @@ w_object(PyObject *v, WFILE *p)
         }
         w_long((long)n, p);
         w_string(s, (int)n, p);
-        if (pb->bf_releasebuffer != NULL)
-            (*pb->bf_releasebuffer)(v, &view);
+        PyBuffer_Release(&view);
     }
     else {
         w_byte(TYPE_UNKNOWN, p);